Process of manufacturing bottle-caps.



J. & J. A. BUTKUS.

PROCESS OF MANUFAGTURING BOTTLE CAPS.

APPLICATION FILED AUG. 21 1911.

1,091,626, Patented Mar. 31, 1914.

Afr-024$) unit STATES PATENT onrion.

JOSEPH BUTKUS, OF CHICAGO, ILLINOIS, AND JOHN A. BU'IKUS, 0F BALTIMORE, HARYLAND.

PROCESS OF MANUFACTURING BOTTLE-CAPS.

Specification of Letters Patent.

Application filed August 21, 1911.

To all whom it may concern Be it known that we, JOSEPH BUTKUS and JOHN A. BUTKUS, citizens of the United States, and residing, respectively, at Chicago, in the county of Cook and State of Illinois, and at Baltimore, State of Maryland, have invented a new and useful Imrovement in Processes of Manufacturing ottle-Caps, of which the following is a complete specification.

The main objects of this invention are to provide an improved process of forming bottle caps; to provide a process of forming bottle caps whereby the sealing disk in the completed cap is rigidly held in the shell and absolutely prevented from creeping in the shell when the cap is being secured on the bottle; to provide an improved process of forming bottle caps by means of which the sealing disks are prevented from blowing when the caps are used on bottles containing highly carbonated or gasified liquids; and to provide a process of forming bottle caps by means of which the sealing disks are rendered impervious to the gases in the liquids contained in the bottles on which the caps are used.

A specific embodiment of the invention is illustrated in the accompanying drawing, in which:

Figure 1 is a view partly in section and partly in elevation, of the shaping dies for the sealing disks, with a shell and disk therein ready to be operated upon. Fig. 2 is a view similar to Fig. 1 but showing the parts at the end of the compression stroke. Fig. 3 is a plan view of the completed disk. Fig. 4 is a section of the completed cap.

In carrying out our invention we employ a female die 1 having a seat in its end of a shape to receive the cap shell 2, which has been previously formed with its reverse or bottom side up. The shell 2 is of the same construction as that shown in Patent No. 935,296, for bottle closures, issued to John A. and Joseph Butkus, Sept. 28, 1909. The seat of the die 1 has an annular depression 3 adapted to receive the annular channel portion 4 of the shell, and a central raised portion 5 adapted to receive the depression 6 of the shell. The shell is placed in the die 1, with the disk 7, of cork or other suitable material, placed therein, as shown in Fig. 1, and the male die 8 is brought down thereon to form or shape the disk to the shell. The

die 8 has an annular raised portion 9, corresponding to the depression '3 in the die 1 and adapted to enter the same, and a central depresslon l0 corres onding to the raised portion 5 of the die 1, ut the depth of which is less than the height of the raised portion 5, so that the portions 10 and 5 will exert greater pressure on the disk than will the portions 9 and 3. Between the disk 7 and the shell 2 is a layer of gummed paper 11, or other suitable adhesive material adapted to stick or secure the disk in the shell when goal: and pressure have been applied to the The assembled shell, disk and gummed layer are heated in any desired manner to heat the disk and the gummed layer before they enter the dies, and when the die 8 is brought down 011 the disk the depression 10 of the die 8 acting on the raised portion 5 of the die 1 compresses the disk more centrally than at its margins, with the result that some of the material in the central portion 12 of the disk 7 is forced laterally and formed into the marginal rib 13 on one side of the disk, thereby making the central portion 12 of less thickness than the annular margin 13, as shown in Fig. 2. The compression of the disk when in a heated state entirely closes the pores of the cork, since the heat renders it more pliable, and it also causes the gummed material to stick the disk firmly to the shell. The closing of the pores of the cork during the formation of the cap is an important feature of our invention, since it renders the disk absolutely impervious to the action of gases in the liquids bottled. The fact that heretofore gases from the liquids could permeate the disk and either blow it away from the shell or oxidize the cork with detrimental eiiect on the liquid, has caused a great deal of trouble to bottlers. Our improved bottle cap entirely eliminates these difliculties. Furthermore when the central portion of the disk is compressed and a portion of its material worked outwardly into the peripheral portion 13, the shoulder 15 formed on the portion 13 impinges behind the sides of the depression 6 of the shell and prevents the disk from creeping inwardly and loosen ing from the central portion of the shell when the cap is being secured to the bottle.

While we have shown and described but one specific method of carrying out our invention, it will be understood that many details of the process described may be varied or omitted without departing from the scope of the claims.

We claim:

1. The process of formin bottle caps, comprising placing a disk 0 compressible material in a shell and subjecting the central portion of said disk to a degree of pressure greater than that to which the other portions of the disk are subjected, so as to force a quantity of the central portion of said disk toward the margins and make the marginal portions of the disk thicker than the central portion thereof, while simultaneously maintaining the marginal portions of the disk'under pressure.

2. The process of forming bottle caps, comprising placing a disk of compressible material in a shell having a depressed central portion surrounded by a channel, and subjecting the central portion of said disk to a degree of pressure greater than that to which the other portions of the disk are subjected, so as to force a quantity of the central portion of the said disk toward its margins and make the marginal portions of said disk thicker than the-central portion thereof and substantially fill said channel, while simultaneously maintaining the marginal portions of the disk under a substantially uniform pressure.

3. The process of forming bottle caps, which consists in subjecting a cork disk to pressure With-the central portion ofthe diskbeing subjected to a degree of pressure greater than that to which the other por- JOSEPH BUTKUS. JOHN A. BUTKUS.

Witnesses to signature ofJoseph Butkus:

W. l/VITHENBURY,

. E. R. WALKER.

\Vitnesses to signature of John A. Butkus:

ALoNzo STIDI-IAM, GUSTAV BLUMBERG. 

